package com.lagou.config;

import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import com.lagou.pojo.SQLCommand;
import com.lagou.pojo.SQLCommandType;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.io.InputStream;
import java.util.List;

public class XMLMapperBuilder {

    private Configuration configuration;

    public XMLMapperBuilder(Configuration configuration) {
        this.configuration =configuration;
    }


    public void parse(InputStream inputStream) throws DocumentException {

        Document document = new SAXReader().read(inputStream);
        Element rootElement = document.getRootElement();

        String namespace = rootElement.attributeValue("namespace");

        List<Element> selectList = rootElement.selectNodes("//select");
        for (Element element : selectList) {
            doParse(element,namespace,SQLCommandType.SELECT);
        }
        List<Element> insertList = rootElement.selectNodes("//insert");
        for (Element element : insertList) {
           doParse(element,namespace,SQLCommandType.INSERT);
        }
        List<Element> updatetList = rootElement.selectNodes("//update");
        for (Element element : updatetList) {
           doParse(element,namespace,SQLCommandType.UPDATE);
        }
        List<Element> deleteList = rootElement.selectNodes("//delete");
        for (Element element : deleteList) {
           doParse(element,namespace,SQLCommandType.DELETE);
        }
    }

    private void doParse(Element element, String namespace, SQLCommandType type){
        String id = element.attributeValue("id");
        String resultType = element.attributeValue("resultType");
        String paramterType = element.attributeValue("paramterType");
        String sqlText = element.getTextTrim();
        MappedStatement mappedStatement = new MappedStatement();
        mappedStatement.setId(id);
        mappedStatement.setResultType(resultType);
        mappedStatement.setParamterType(paramterType);
        SQLCommand sqlCommand = new SQLCommand(sqlText, type);
        mappedStatement.setSqlCommand(sqlCommand);
        String key = namespace+"."+id;
        configuration.getMappedStatementMap().put(key,mappedStatement);
    }
}
